Device for protecting blasting-caps.



No. 746,262. PATENTED DEC. 8, 1903. D. B. GILLIES.

DEVICE FOR PROTECTING BLASTING CAPS.

APPLICATION FILED MAY e, 1903.

E0 MODEL.

wnmassas mum-me v i 444.. /J;

iJNi'rsn STATES- Patented December 8, 1908.

ATENT rides.

DONALD B. GILLIES, OF BUTTE, MONTANA, ASSIGNOR TO RALPH -BAGGALEY,.OFPITTSBURG, PENNSYLVANIA.

fisvlcs'F-oe PROTECTING BLASTlNG-CAPS.

SPEGIFICATIUN forming part of Letters Patent No. 746,262, dated December8, 1903.

To all whom it may concern:

Be it known that I, DONALD. E. GILLIEs, of Butte, Silver Bow county,Montana, have invented a new and useful Device for ProtectingBlasting-Gaps, of which the followingis a full, clear, and exactdescription, reference being had to the accompanying drawings, formingpart of this specification, in which- Figure l is a longitudinal sectionof the sheath. Fig. 2, is a side view, and Fig. 3 an end view, of aguide for inserting the cap into the sheath. Fig 4 is a sectional viewshowing the cap incased in the sheath. -J Iii-blasting operations,especially in mines where there are water-veins, many accidents haveoccurred by reason of the wetting of the explosive-caps which are usedto explode the charges of dynamite. It is the practice in mining toexplode the charges in a number of blast-holes, and when one of themfails to explode it will remain unnoticed, but is apt to explode withdangerous effect whenstruck by a minerjs pick or drill. a

My invention provides means by which certainty of explosion of the capsis secured, and

I efiect this result by providing means for readily incasing the cap ina flexible waterproof sheath, preferably of rubber, which when fittedtightly around the cap excludes water from it and keeps it dry-an'd fitfol-detonationunder all conditions.

15: Fig. 1 of the accompanying drawings, 2

Application filed May 6, 1903. Serial No. 155,802. (No model.)

represents the flexible rubber sheath, which in Fig. 4 is shown fittedaround the detonating cap 3, to which the fuse 4 is attached. The

neck of the sheath is preferably contracted, as shown in Fig. 1, so thatit will fit tightly against the cap or the fuse.

In Figs. 2 and 3 I show a device consisting of a tapering guide-framecomposed. of a slotted ring 5 and spring-arms 6, which I use for fittingthe cap in the sheath. The springarms 6 of this guide-frame are insertedinto the sheath, the -cap is pushed-between the arms, and the guide can.ihen be withdrawn, leaving the cap incased'in the rubber, as shown inFig. 4.

I claim- 1. A guide for inserting a blasting-cap into afiexible'sheath,said guide comprising springarnis adapted to be insertedinto the sheath and affording between them a passage for the cap;substantially as described.

2. A guide for inserting a blasting-cap into a flexible sheath, saidguide comprising tapering spring-arms adapted to be inserted into thesheath and affording between them a passage forvthe cap; substantiallyas described.

'In testimony whereof I have hereunto set my hand. 3

" DONALD E. GILLIES.

Witnesses:

WM. M. KIRKPATRICK, D. E. J AOKMAN.

